Research On SCTP-based Traffic Distribution And Scheduling In Heterogeneous Wireless Networks

With the development of Network and terminal technology, the future communication network will be a heterogeneous network including more than one network which is demanded to co-operate with each others. As a part of the Network intergration, Multipath transmission has many advantages such as improving business transmission rate, agile using of network resources to support more kinds of services. Based on SCTP protocol which support multipath parallel transmission, the distribution of transmission problem becomes a common concern. Research shows that the difference of transmission path will lead to out-of-order problem which has influence on throughput and transmission delay. The fluctuation of wireless bandwidth and delay makes the problem more complicated. How to distribute and schedule the flow by using the path characteristic parameters to solve the problem is the main work of our content.First we summarize the existing multipath parallel transmission method, and sum up the limitation is that the scheduling strategy is regardless of the channel time-varying. Secondly, make a deep analysis of out-of-order problem caused by different random transmission delay and point out that the mean and variance of delay will affect the probability of out-of-order. Then put forward a distribution scheduling methods aim to decrease the probability of out-of-order by using Path delay distribution features. Finally, considering the path bandwidth fluctuation caused the difference of transmission delay, we analyse this problem through a queuing model and give a kind of optimization allocation of traffic flow and data scheduling algorithm. The simulation results show that both of the method can effectively reduce the disorder and reduce the end-to-end delay.